Reciprocating pump

Abstract

In a reciprocating pump which performs a pumping action by causing a reciprocating member to reciprocate as a driving part including a driving shaft accommodated in a driving part case is driven, a portion of the driving part is immersed in a lubricating oil in the driving part case, and one or more ribs are provided on an upper part of an inner wall forming the driving part case so as to be directed inward.

What is claimed is: 
     
       1. A reciprocating pump which performs a pumping action by causing a reciprocating member to reciprocate as a driving part including a driving shaft accommodated in a driving part case is driven, a portion of the driving part being immersed in a lubricating oil in the driving part case, the driving part case including an inner wall which has an upper part positioned above the lubricating oil, the reciprocating pump comprising:
 one or more ribs which are provided on the upper part of the inner wall of the driving part case so as to be directed inward, 
 wherein at least one of the ribs is disposed directly above the driving shaft. 
 
     
     
       2. The reciprocating pump according to  claim 1 ,
 wherein a sectional shape of the inner wall of the driving part case perpendicular to an axis of the driving shaft is an elliptical shape. 
 
     
     
       3. The reciprocating pump according to  claim 1 ,
 wherein at least one of the ribs is directed inward toward a center axis of the driving shaft. 
 
     
     
       4. A reciprocating pump comprising:
 a reciprocating member configured to reciprocate as a driving part including a driving shaft is driven, to cause a pump action, 
 a driving part case accommodating the driving shaft, the driving part case including an inner wall which has an upper part positioned above a center axis of the driving shaft, 
 first and second ribs which are provided on the upper part of the inner wall of the driving part case so as to be directed inward, the first and second ribs being disposed at different positions in a circumferential direction of the inner wall. 
 
     
     
       5. The reciprocating pump according to  claim 4 ,
 wherein the first rib is disposed directly above the driving shaft. 
 
     
     
       6. The reciprocating pump according to  claim 4 ,
 wherein the first rib is directed inward toward the center axis of the driving shaft. 
 
     
     
       7. The reciprocating pump according to  claim 4 ,
 wherein the second rib is disposed obliquely above the driving shaft. 
 
     
     
       8. The reciprocating pump according to  claim 7 ,
 wherein the second rib is directed inward toward the center axis of the driving shaft. 
 
     
     
       9. A reciprocating pump comprising:
 a reciprocating member configured to reciprocate as a driving part including a driving shaft is driven, to cause a pump action, 
 a driving part case accommodating the driving shaft, the driving part case including an inner wall, 
 a plurality of ribs which are disposed at different positions in a circumferential direction of the inner wall, the ribs being provided on the inner wall of the driving part case so as to be directed inward toward a center axis of the driving shaft. 
 
     
     
       10. The reciprocating pump according to  claim 9 ,
 wherein at least one of the ribs is disposed directly above the driving shaft. 
 
     
     
       11. The reciprocating pump according to  claim 9 ,
 wherein at least one of the ribs is disposed obliquely above the driving shaft.